Methods and devices for configuring and monitoring search space of PDCCH

ABSTRACT

Methods and devices for configuring and monitoring a search space of a PDCCH are provided. The specific solution includes: transmitting PDCCH configuration information to a UE, where the PDCCH configuration information is for indicating at least one search space of a PDCCH of the UE, and the search space is any one of the following types: a common search space; a group common search space, or a UE specific search space.

CROSS-REFERENCE TO RELATED APPLICATION

This application is the U.S. national phase of PCT Application No.PCT/CN2018/097375 filed on Jul. 27, 2018, which claims a priority toChinese Patent Application No. 201710687931.7 filed on Aug. 11, 2017,the disclosures of which are incorporated in their entirety by referenceherein.

TECHNICAL FIELD

Embodiments of present disclosure relate to the field of radiocommunication technology, and in particular to methods and devices forconfiguring and monitoring a search space of a PDCCH.

BACKGROUND

For 5th generation (5G) mobile communication, in the discussion of thestandard of new radio access technology (NR), a user equipment (UE)needs to monitor multiple types of pieces of downlink controlinformation (DCI). The UE can obtain the DCI by detecting, in a searchspace of the UE through blind detection, a physical downlink controlchannel (PDCCH) transmitted by a network device.

However, in the related technologies, there is no specific solution forhow to set search space for UE, which causes the UE to fail to receivemultiple types of pieces of downlink control information in a timely andeffective manner.

SUMMARY

Embodiments of the present disclosure provide methods and devices forconfiguring and monitoring a search space of a PDCCH.

Technical solutions of the embodiments of the present disclosure are asfollows.

In a first aspect of the embodiments of the present disclosure, a methodfor configuring a search space of a PDCCH is provided, which is appliedto a network device. The method for configuring the search space of thePDCCH includes: transmitting PDCCH configuration information to a UE,where the PDCCH configuration information is for indicating at least onesearch space of a PDCCH of the UE, and the search space is any one ofthe following types: a common search space, a group common search space,or a UE specific search space; where types of DCI transmitted by thenetwork device with the different types of search spaces are different.

In a second aspect of the embodiments of the present disclosure, amethod for monitoring a search space of a PDCCH is provided, which isapplied to a UE. The method for monitoring the search space of the PDCCHincludes: receiving PDCCH configuration information transmitted by anetwork device; and monitoring a search space of a PDCCH of the UEindicated by the PDCCH configuration information, and receiving DCIcorresponding to the search space of the PDCCH of the UE. The PDCCHconfiguration information is for indicating at least one search space ofthe PDCCH of the UE, and the search space is any one of the followingtypes: a common search space, a group common search space, or a UEspecific search space. Types of downlink control information (DCI)transmitted by the network device with the different types of searchspaces are different.

In a third aspect of the embodiments of the present disclosure, anetwork device is provided. The network device includes a transmittingunit. The transmitting unit is configured to transmit PDCCHconfiguration information to a UE, where the PDCCH configurationinformation is for indicating at least one search space of a PDCCH ofthe UE, and the search space is any one of the following types: a commonsearch space, a group common search space, or a UE specific searchspace. Types of DCI transmitted by the network device with the differenttypes of search spaces are different.

It should be noted that, for specific implementations of the networkdevice, reference may be made to behavior functions of the networkdevice in the method for configuring the search space of the PDCCHprovided in the first aspect above, and details are not describedherein. Therefore, the network device provided in the third aspect canachieve the same beneficial effects as the first aspect above.

In a fourth aspect of the embodiments of the present disclosure, a UE isprovided. The UE includes a receiving unit. The receiving unit isconfigured to receive PDCCH configuration information transmitted by anetwork device, where the PDCCH configuration information is forindicating at least one search space of a PDCCH of the UE, the searchspace is any one of the following types: a common search space, a groupcommon search space, or a UE specific search space, and types of DCItransmitted by the network device with the different types of searchspaces are different. The receiving unit is further configured tomonitor the search space of the PDCCH of the UE indicated by the PDCCHconfiguration information, and receive DCI corresponding to the searchspace of the PDCCH of the UE.

It should be noted that, for specific implementations of the UE,reference may be made to behavior functions of the UE in the method formonitoring the search space of the PDCCH provided in the second aspect,and details are not described herein. Therefore, the UE provided in thefourth aspect can achieve the same beneficial effects as the secondaspect above.

In a fifth aspect of the embodiments of the present disclosure, anetwork device is provided. The network device may include a processor,a memory, and a program stored on the memory and executable by theprocessor. When the program is executed by the processor, the method forconfiguring the search space of the PDCCH according to the first aspectis implemented.

In a sixth aspect of the embodiments of the present disclosure, acomputer readable storage medium is provided. The computer readablestorage medium has a program stored thereon, and when the program isexecuted by the processor in the fifth aspect, the method forconfiguring the search space of the PDCCH is implemented.

In a seventh aspect of the embodiments of the present disclosure, acomputer program product is provided. When the computer program productis executed on a computer, the computer is instructed to execute themethod for configuring the search space of the PDCCH according to thefirst aspect.

In an eighth aspect of the embodiments of the present disclosure, adevice for configuring a search space of a PDCCH is provided. The devicefor configuring the search space of the PDCCH exists in a product formof a chip. The device for configuring the search space of the PDCCH mayinclude a processor and a memory, and a program stored on the memory andexecutable by the processor. When the program is executed by theprocessor, the method for configuring the search space of the PDCCHaccording to the first aspect is implemented.

In a ninth aspect of the embodiments of the present disclosure, a UE isprovided, and the UE may include a processor, a memory, and a programstored on the memory and executable by the processor. When the programis executed by the processor, the method for monitoring the search spaceof the PDCCH according to the second aspect is implemented.

In a tenth aspect of the embodiments of the present disclosure, acomputer readable storage medium is provided. The computer readablestorage medium has a program stored thereon. When the program isexecuted by the processor in the ninth aspect, the method for monitoringthe search space of the PDCCH according to the second aspect isimplemented.

In an eleventh aspect of the embodiments of the present disclosure, acomputer program product is provided. When the computer program productis executed on a computer, the computer is instructed to execute themethod for monitoring the search space of the PDCCH according to thesecond aspect.

In a twelfth aspect of the embodiments of the present disclosure, adevice for monitoring a search space of a PDCCH is provided. The devicefor monitoring the search space of the PDCCH exists in a product form ofa chip. The device for monitoring the search space of the PDCCH mayinclude: a processor, a memory and a program stored on the memory andexecutable by the processor. When the program is executed by theprocessor, the method for monitoring the search space of the PDCCHaccording to the second aspect is implemented.

BRIEF DESCRIPTION OF THE DRAWINGS

To better clarify technical solutions of embodiments of the presentdisclosure or in the related technologies, drawings used in descriptionof the embodiments of the present disclosure or the related technologiesare briefly introduced hereinafter. Apparently, the described drawingsmerely illustrate a part of the embodiments of the present disclosure. Aperson ordinary skilled in the art can obtain other drawings based onthe described drawings without any creative efforts.

FIG. 1 is a schematic diagram of a system architecture according toembodiments of the present disclosure;

FIG. 2 is a schematic structural diagram of a UE according toembodiments of the present disclosure;

FIG. 3 is a schematic structural diagram of a base station according toembodiments of the present disclosure;

FIG. 4 is a flowchart of a method for configuring a search space of aPDCCH according to embodiments of the present disclosure;

FIG. 5 is a flowchart of a method for monitoring a search space of aPDCCH according to embodiments of the present disclosure;

FIG. 6 is a schematic structural diagram of a network device accordingto embodiments of the present disclosure; and

FIG. 7 is a schematic structural diagram of a UE according toembodiments of the present disclosure.

DETAILED DESCRIPTION

In the description of the present disclosure, unless otherwise stated,the term of “multiple” refers to two or more. For example, multiplecommon search spaces refers to that two or more common search spaces areincluded.

In the embodiments of the present disclosure, term such as “exemplary”or “for example” are used to indicate example, instance or illustration.Any embodiment or design solution described with “exemplary” or “forexample” in the embodiments of the present disclosure should not beconstrued as more preferred or advantageous over other embodiments ordesigns. Rather, the use of the term of “exemplary” or “for example” isintended to present relevant concepts in a concrete manner.

In addition, terms such as “include” and “have” and any variationsthereof in the description of the present disclosure are intended tocover non-exclusive inclusion. For example, a process, method, system,product, or device including a series of steps or units is not limitedto those steps or units that are explicitly listed, but may optionallyinclude other steps or units that are not explicitly listed or that areinherent in the process, method, product, or device.

In the following description, for the purpose of explanation rather thanlimitation, specific details such as specific system structure,interface, and technology are provided to thoroughly understand thepresent disclosure. However, it should be clear to those skilled in theart that the present disclosure can be implemented in other embodimentswithout these specific details. In other cases, detailed descriptions ofwell-known devices, circuits, and methods are omitted, so as not toobscure the description of the present disclosure with unnecessarydetails.

Methods and devices for configuring and monitoring a search space of aPDCCH provided by the embodiments of the present disclosure may beapplied to the process of configuring the search space of the PDCCH andmonitoring the search space of the PDCCH.

Some concepts involved in the methods and devices for configuring andmonitoring the search space of the PDCCH provided by the embodiments ofthe present disclosure are explained hereinafter.

Search space: a search space in a Long Term Evolution (LTE) system isdefined as a series of control channel element (CCE) resources that needto be blindly detected for each aggregation level, including CCEstarting position and the quantity of candidate resources.

Common search space: a common search space is commonly used by all UEsin a cell.

Group common search space: a group common search space is used by agroup, including M UEs, in a cell.

UE specific search space: a UE specific search space is used by a UE.

Control Resource Set (CORESET): a type of time-frequency resource setintroduced in NR. The UE detects PDCCH on the corresponding controlresource set. The control resource set is formed by a set of resourceelement groups (REGs).

Quasi-Co-Location (QCL) relationship: a QCL relationship between twosignals means that the two signals have some correlation in statisticalcharacteristics, including delay spread, Doppler spread, Doppler shift,average gain and average delay.

Wideband reference signal: a reference signal transmitted on a controlresource set bandwidth corresponding to a search space.

Narrowband reference signal: a reference signal in a CCE bandwidthoccupied by a PDCCH in a search space.

The embodiments of the present disclosure are described in detail withreference to the drawings hereinafter.

Reference is made to FIG. 1 . FIG. 1 is a schematic diagram of a systemarchitecture to which methods and devices for configuring and monitoringa search space of a PDCCH according to embodiments of the disclosure areapplied. As shown in FIG. 1 , the system architecture may include a UE01 and a network device (such as a base station 02). The UE 01 and thebase station 02 are communicatively connected.

UE 01 may refer to a device configured to provide voice and/or dataconnectivity to a user, a handheld device with wired connection/wirelessconnection function, or any other processing device connected to awireless modem. UE 01 may communicate with one or more network devicesvia a radio access network (RAN). UE 01 may be a mobile terminal, suchas a mobile phone (or a cellular phone) or a computer equipped with amobile terminal, or may be a portable, pocket-sized, handheld,computer-built-in or vehicle-mounted mobile device, which exchangesvoice and/or data with a RAN. For example, it may be a personalcommunication service (PCS) phone, a cordless phone, a sessioninitiation protocol (SIP) phone, a wireless local loop (WLL) station, ora personal digital assistant (PDA), which is not limited herein.

The base station is a device deployed in a radio access network, toprovide a radio communication function for the UE 01. The base stationmay include various forms such as macro base station, micro basestation, relay station, access point, and so on. In systems usingdifferent radio access technologies, the names of devices with basestation functions may be different. For example, in an LTE system, itmay be called an evolved base station (evolved NodeB, eNB, or eNodeB);in a 3rd generation telecommunication (3G) system, it may be called abase station (Node B), and so on. As communication technology evolves,the name of “base station” may change.

Embodiments of the present disclosure provide a UE. FIG. 2 is aschematic structural diagram of a UE 01 provided by embodiments of thepresent disclosure. As shown in FIG. 2 , the UE 01 includes: at leastone processor 11, a memory 12, a user interface 13, and at least onenetwork interface 14. The various components in the UE 01 are coupledtogether via a bus system 15.

It can be understood that the bus system 15 is configured to implementconnection and communication between these components. In addition to adata bus, the bus system 15 includes a power bus, a control bus, and astate signal bus. For clarity, various buses are marked as the bussystem 15 in FIG. 2 .

The user interface 13 may include a display, a keyboard, or a clickingdevice (such as, a mouse, a trackball), a touch panel, or a touchscreen.

It can be understood that the memory 12 in the embodiments of thepresent disclosure may be a volatile memory or a non-volatile memory, ormay include both volatile and non-volatile memories. The non-volatilememory may be a read-only memory (ROM), a programmable read-only memory(Programmable ROM, PROM), an erasable programmable read-only memory(Erasable PROM, EPROM), or an electrically erasable programmableread-only memory (Electrically EPROM, EEPROM) or a flash memory. Thevolatile memory may be a random access memory (RAM) that acts as ahigh-speed external cache. By way of example and not limitation, variouskinds of RAMs are available, such as a static random access memory(Static RAM, SRAM), a dynamic random access memory (Dynamic RAM, DRAM),a synchronous dynamic random access memory (Synchronous DRAM, SDRAM), adouble data rate synchronous dynamic random access memory (Double DataRate SDRAM, DDRSDRAM), an enhanced synchronous dynamic random accessmemory (Enhanced SDRAM, ESDRAM), a synchlink dynamic random accessmemory (Synchlink DRAM, SDRAM) or a direct rambus random access memory(Direct Rambus RAM, DRRAM). The memory 12 described in the embodimentsof the present disclosure is intended to include, without being limitedto, these and any other suitable types of memories.

In some implementations, the memory 12 stores the following elements,executable modules or data structures, or a subset thereof, or anextended set thereof: operating system 121 and application 122.

The operating system 121 includes various system programs such as aframework layer, a core library layer and a driving layer, forimplementing various fundamental services and processing hardware-basedtasks. The application 122 includes various applications such as mediaplayer and browser, for implementing various application services. Aprogram for implementing the method according to the embodiments of thepresent disclosure may be included in the application 122.

In the embodiments of the present disclosure, the UE 01 may furtherinclude a computer program stored on the memory 12 and executable by theprocessor 11, and when the computer program is executed by the processor11, the steps of the method provided by the embodiments of the presentdisclosure are implemented.

The methods according to the foregoing embodiments of the presentdisclosure may be applied to the processor 11, or implemented by theprocessor 11. The processor 11 may be an integrated circuit chip withsignal processing capabilities. In implementation, each step of theforegoing methods may be completed by an integrated logic circuit inform of hardware in the processor 11 or instructions in form ofsoftware. The processor 11 above may be a general-purpose processor, adigital signal processor (DSP), an application specific integratedcircuit (ASIC), a field programmable gate array (FPGA) or any otherprogrammable logic device, a discrete gate, a transistor logic device ora discrete hardware component, which can implement or carry out themethods, steps, and logical block diagrams according to the embodimentsof the present disclosure. The general-purpose processor may be amicroprocessor, or the processor may be any conventional processor orthe like. The steps of the methods according to the embodiments of thepresent disclosure may be directly implemented by a hardware decodingprocessor, or may be performed by a combination of hardware and softwaremodules in the decoding processor. The software module may be located ina conventional well-developed computer readable storage medium such as arandom access memory, a flash memory, a read-only memory, a programmableread-only memory, an electrically erasable programmable memory, aregister, or the like. The computer readable storage medium is locatedin the memory 12, and the processor 11 reads the information in thememory 12 and completes the steps of the above methods in combinationwith its hardware. Specifically, a computer program is stored on thecomputer readable storage medium, and when the computer program isexecuted by the processor 11, the steps of the method embodimentsprovided by the embodiments of the present disclosure are implemented.

It can be understood that the embodiments described herein may beimplemented in hardware, software, firmware, middleware, microcode, or acombination thereof. For hardware implementation, the processing unitmay be implemented in one or more application specific integratedcircuits (ASIC), digital signal processors (DSP), digital signalprocessing devices (DSP Device, DSPD), programmable logic devices (PLD),field-programmable gate arrays (FPGA), general purpose processors,controllers, microcontrollers, microprocessors, other electronics unitsfor performing the functions according to the present disclosure or acombination thereof.

For software implementation, the technical solutions according to theembodiments of the present disclosure may be implemented by modules(e.g., processes, functions, and so on) for performing the functionsaccording to the embodiments of the present disclosure. Software codesmay be stored in a memory and executed by a processor. The memory may beimplemented in the processor or external to the processor.

Embodiments of the present disclosure provide a base station. FIG. 3 isa schematic structural diagram of a base station 02 provided byembodiments of the present disclosure. As shown in FIG. 3 , the basestation 02 includes: a processor 21, a transceiver 22, a memory 23, auser interface 24, and a bus interface.

The processor 21 may be in charge of managing the bus architecture andcommon processes. The memory 23 may be configured to store data used bythe processor 21 in performing operations.

In the embodiments of the present disclosure, the base station 02 mayfurther include: a computer program stored on the memory 23 andexecutable by the processor 21, and when the computer program isexecuted by the processor 21, the steps of the method provided by theembodiments of the present disclosure are implemented.

In FIG. 3 , a bus architecture may include any quantity ofinterconnected buses and bridges. Various circuits including one or atleast two processors represented by the processor 21 and a memoryrepresented by the memory 23 are coupled together. The bus architecturemay also couple various other circuits such as a peripheral component, avoltage regulator, and a power management circuit, which are well knownin the art and thus are not further described herein. A bus interfaceprovides an interface. The transceiver 22 may be multiple elements,i.e., including a transmitter and a receiver, which provides a unit forcommunicating with various other devices on a transmission medium. Fordifferent UEs, the user interface 24 may be an interface capable ofconnecting needed external or internal devices. The connected devicesinclude, but not limited to, a keypad, a display, a speaker, amicrophone, a joystick, and the like.

Based on the interaction between the UE 01 and the base station 02 inthe system shown in FIG. 1 , each module or component of the UE 01 shownin FIG. 2 , and each module or component of the base station 02 shown inFIG. 3 , a method for configuring a search space of a PDCCH is providedaccording to the embodiments of the present disclosure. In the method,the interaction process between the UE and the network device isdescribed in detail. Specifically, as shown in FIG. 4 , the method forconfiguring the search space of the PDCCH may include steps S401 toS402.

In step S401, the network device transmits PDCCH configurationinformation to the UE.

The PDCCH configuration information is for indicating at least onesearch space of a PDCCH of the UE, and the search space is any one ofthe following types: a common search space, a group common search space,or a UE specific search space. Types of downlink control information(DCI) transmitted by the network device with the different types ofsearch spaces are different.

Exemplarily, the network device may transmit high layer signaling to theUE via the transceiver 22, where the high layer signaling carries thePDCCH configuration information. Or, the network device may transmit thePDCCH configuration information to the UE via the transceiver 22, in aform of broadcasting a system message (such as a master informationblock) to the UE. The PDCCH configuration information may be predefinedby the network device according to one or more of: a system bandwidth, asubcarrier spacing, antenna configuration, or a carrier frequency, etc.

One common search space is commonly used by N UEs, one or more commonsearch spaces correspond to one control resource set, and N is apositive integer greater than or equal to 2.

Exemplarily, a common search space may be commonly used by all UEs in acell. The control resource set is a type of time-frequency resource setintroduced in the NR. The UE detects PDCCH in the corresponding controlresource set. The control resource set is formed by a set of resourceelement groups (REG).

One group common search space is used by a group including M UEs, one ormore group common search spaces correspond to one control resource set,and M is a positive integer greater than or equal to 2.

For example, it is assumed that there are 10 UEs in a cell, Group 1including 3 UEs uses a group common search space, Group 2 including 4UEs uses a group common search space, and Group 3 including 3 UEs uses agroup common search space.

One UE specific search space is used by one UE, and one or more UEspecific search spaces correspond to one control resource set.

Exemplarily, in a first application scenario of the embodiments of thepresent disclosure, the search space is the common search space.Correspondingly, the DCI transmitted by the network device using thecommon search space includes at least one of the following information:DCI for scheduling system information, DCI for scheduling paginginformation, or DCI for scheduling a random access response message.

In the first application scenario of the embodiments of the presentdisclosure, the PDCCH transmitted with the common search space has a QCLrelationship with a synchronization signal or a group of synchronizationsignals. There is a correspondence between the synchronization signal orthe group of synchronization signals and a physical broadcast channel(PBCH) configuring a physical resource of the common search space.

There being a correspondence between the synchronization signal or thegroup of synchronization signals and the PBCH configuring the physicalresource of the common search space includes that: time index(es) of thesynchronization signal or the group of synchronization signals and atime index of the PBCH configuring the physical resource of the commonsearch space are the same. That is, the synchronization signal or thegroup of synchronization signals are in the same beam as the PBCHconfiguring the physical resource of the common search space.

Exemplarily, in a second application scenario of the embodiments of thepresent disclosure, the search space is the group common search space.Correspondingly, the DCI transmitted by the network device using thegroup common search space includes at least one of the followinginformation: DCI for transmitting a group based power control command,DCI for transmitting group based slot format information, or DCI fortransmitting group based resource preemption indication.

In the second application scenario of the embodiments of the presentdisclosure, the PDCCH transmitted with the group common search space hasa QCL relationship with a synchronization signal or a group ofsynchronization signals, and the synchronization signal or the group ofsynchronization signals are configured by the network device; or, thePDCCH transmitted with the group common search space has a QCLrelationship with a channel state information-reference signal (CSI-RS)or a group of CSI-RSs, and the CSI-RS or the group of CSI-RSs areconfigured by the network device.

Exemplarily, in a second application scenario of the embodiments of thepresent disclosure, a position of the search space of the UE may beexplicitly configured by the network device. Correspondingly, the PDCCHconfiguration information may specifically include search space positioninformation of the UE. The search space position information of the UEis for indicating a position of the search space of the UE, and theposition of the search space of the UE is irrelevant to an identity ofthe UE.

The search space position information of the UE may include at least oneof: a starting position of the search space of the UE, a control channelelement (CCE) aggregation level of the search space of the UE, or thequantity of PDCCH candidate resources of the search space of the UE. Forexample, the CCE aggregation level of the search space of the UE mayinclude {1,2,4,8,16,32}.

Exemplarily, in the second application scenario of the embodiments ofthe present disclosure, the position of the search space of the UE alsobe implicitly configured by the network device. Correspondingly, searchspace position information of the UE is pre-configured by a protocol,and the position of the search space of the UE is irrelevant to anidentity of the UE. It should be noted that, for specific content of thesearch space position information of the UE, reference can be made tothe description in the foregoing embodiments, and details are notdescribed herein.

For example, the search space position information of the UEpre-configured by the protocol may be starting from CCE #0 in a fixedmanner, and/or fixed aggregation level.

In the second application scenario of the embodiments of the presentdisclosure, positions of search spaces of UEs meeting at least one ofthe following conditions are the same: starting positions of the searchspaces of the UEs are the same, CCE aggregation levels of the searchspaces of the UEs are the same, or, the quantities of PDCCH candidateresources of the search spaces of the UEs are the same; and theembodiments of the present disclosure are not limited thereto.

Exemplarily, in a third application scenario of the embodiments of thepresent disclosure, the search space is the UE specific search space.Correspondingly, the DCI transmitted by the network device using the UEspecific search space includes at least one of the followinginformation: DCI for UE-specific scheduling, or DCI for semi-persistentscheduling. Time-frequency resources of control resource setscorresponding to UE specific search spaces of PDCCHs of different UEsare orthogonal, overlapped or partially overlapped.

In the third application scenario of the embodiments of the presentdisclosure, the PDCCH transmitted with the UE specific search space hasa QCL relationship with a synchronization signal or a group ofsynchronization signals, and the synchronization signal or the group ofsynchronization signals are configured by the network device; or, thePDCCH transmitted with the UE specific search space has a QCLrelationship with a CSI-RS or a group of CSI-RSs, and the CSI-RS or thegroup of CSI-RSs are configured by the network device.

Exemplarily, in the third application scenario of the embodiments of thepresent disclosure, the position of the search space of the UE may beexplicitly configured by the network device. Accordingly, the PDCCHconfiguration information may specifically include search space positioninformation of the UE, and the position of the search space of the UE isrelevant to an identity of the UE. It should be noted that, for specificcontent of the search space position information of the UE, referencecan be made to the description in the foregoing embodiments, and detailsare not described herein.

Exemplarily, in the third application scenario of the embodiments of thepresent disclosure, the position of the search space of the UE may beimplicitly configured by the network device. Correspondingly, searchspace position information of the UE is pre-configured by a protocol,and the position of the search space of the UE is relevant to anidentity of the UE. It should be noted that, for specific content of thesearch space position information of the UE, reference can be made tothe description in the foregoing embodiments, and details are notdescribed herein.

In step S402, the UE receives the PDCCH configuration informationtransmitted by the network device.

The UE may receive, via the network interface 14, the PDCCHconfiguration information transmitted by the network device. The UE maydetermine the search space of the PDCCH of the UE according to anindication of the PDCCH configuration information.

The method for configuring the search space of the PDCCH is providedaccording to the embodiments of the present disclosure. The networkdevice achieves the object of configuring the search space of the PDCCHof the UE by transmitting the PDCCH configuration information to the UE.In addition, since the network device transmits the PDCCH configurationinformation to the UE to indicate at least one search space of the PDCCHof the UE, the UE may be enabled to detect PDCCH in the search space ofthe PDCCH of the UE indicated by the PDCCH configuration information,thereby ensuring that the UE can receive DCI from the network device ina timely and effective manner.

Further, after the UE is configured with the search space of the PDCCHof the UE, PDCCH detection may be performed in the search space of thePDCCH of the UE. Specifically, the embodiments of the present disclosurefurther provide a method for monitoring a search space of a PDCCH.Reference is made to FIG. 5 , as compared with the method forconfiguring the search space of the PDCCH shown in FIG. 4 , step S501 isfurther performed after step S402 described above. Only different partsare described in detail herein. Referring to FIG. 5 , the method formonitoring the search space of the PDCCH includes steps S401, S402, andS501.

In step S401, the network device transmits PDCCH configurationinformation to the UE.

In step S402, the UE receives the PDCCH configuration informationtransmitted by the network device.

In step S501, the UE monitors the search space of the PDCCH of the UEindicated by the PDCCH configuration information, and receives DCIcorresponding to the search space of the PDCCH of the UE.

The UE may receive the DCI transmitted by the network device, in thesearch space of the PDCCH of the UE configured by the network device,and the type of the DCI corresponds to the search space of the PDCCH ofthe UE.

For example, the network device uses a common search space 1 to transmitDCI, and the UE monitors the PDCCH in the common search space 1 of thePDCCH of the UE, to receive the DCI (such as DCI for scheduling systeminformation, DCI for scheduling paging information and/or DCI forscheduling a random access response message) corresponding to the commonsearch space 1 of the PDCCH of the UE; the network device uses a groupcommon search space 2 to transmit DCI, and the UE monitors the PDCCH inthe group common search space 2 of the PDCCH of the UE, to receive theDCI (DCI for transmitting a group based power control command, DCI fortransmitting group based slot format information and/or DCI fortransmitting group based resource preemption indication) correspondingto the group common search space 2 of the PDCCH of the UE.

Exemplarily, in the embodiments of the present disclosure, a referencesignal used by the UE to monitor the PDCCH in the common search spaceincludes a wideband reference signal or a narrowband reference signal,the wideband reference signal is a reference signal transmitted in acontrol resource set bandwidth corresponding to the common search space,and the narrowband reference signal is a reference signal in a CCEbandwidth occupied by the PDCCH in the common search space.

Exemplarily, in the embodiments of the present disclosure, a referencesignal used by the UE to monitor the PDCCH in the group common searchspace includes a wideband reference signal or a narrowband referencesignal, the wideband reference signal is a reference signal transmittedin a control resource set bandwidth corresponding to the group commonsearch space, and the narrowband reference signal is a reference signalin a CCE bandwidth occupied by the PDCCH in the group common searchspace.

Exemplarily, in the embodiments of the present disclosure, a referencesignal used by the UE to monitor the PDCCH in the UE specific searchspace includes a narrowband reference signal, and the narrowbandreference signal is a reference signal in a CCE bandwidth occupied bythe PDCCH in the UE specific search space.

The method for monitoring the search space of the PDCCH is providedaccording to the embodiments of the present disclosure. The UE maymonitor the PDCCH in the search space of the PDCCH of the UE indicatedby the PDCCH configuration information. Since the PDCCH configurationinformation is for indicating at least one search space of the PDCCH ofthe UE, when the UE performs PDCCH detection in the search space of thePDCCH of the UE indicated by the PDCCH configuration information, it canbe ensured that the UE may receive, in a timely and effective manner,the DCI transmitted by the network device.

The above mainly introduces the solutions provided by the embodiments ofthe present disclosure from the perspective of the network device andthe UE. It can be understood that, in order to implement the abovefunctions, the network device and the UE include a hardware structureand/or a software module corresponding to the various functions. Thoseskilled in the art will appreciate that the network device, the UE andthe algorithm steps described in conjunction with the embodimentsaccording to the present disclosure may be implemented in the form ofhardware or a combination of hardware and computer software. Whether afunction is performed in hardware or in hardware driven by computersoftware depends on the specific application and design constraints ofthe solution. Those skilled in the art may use different methods toimplement the described functions for each particular application, andsuch implementations are not to be considered as departing from thescope of the present disclosure.

The embodiments of the present disclosure may divide the network deviceand the UE into functional modules or functional units according to theforegoing method examples. For example, each functional module orfunctional unit may be divided corresponding to each function, or two ormore functions may be integrated in a processing module. The integratedmodule may be implemented in the form of hardware, or in the form ofsoftware functional module or functional unit. The division of modulesor units in the embodiments of the present disclosure is exemplary, andthe modules or units are divided merely in logical function, which maybe divided in another way in actual implementation.

In a case where each functional module is divided according to eachfunction, FIG. 6 shows a practicable structural diagram of the networkdevice involved in the foregoing embodiments. As shown in FIG. 6 , thenetwork device 600 may include: a transmitting unit 601.

The transmitting unit 601 is configured to transmit physical downlinkcontrol channel (PDCCH) configuration information to a user equipment(UE), where the PDCCH configuration information is for indicating atleast one search space of a PDCCH of the UE, and the search space is anyone of the following types: a common search space, a group common searchspace, or a UE specific search space. Types of downlink controlinformation (DCI) transmitted by the network device with the differenttypes of search spaces are different.

The transmitting unit 601 is configured to support step S401 in theforegoing embodiments, and/or other processes used in the technologydescribed herein.

In a practicable implementation, one common search space is commonlyused by N UEs, one or more common search spaces correspond to onecontrol resource set, and N is a positive integer greater than or equalto 2. One group common search space is used by a group including M UEs,one or more group common search spaces correspond to one controlresource set, and M is a positive integer greater than or equal to 2.One UE specific search space is used by one UE, and one or more UEspecific search spaces correspond to one control resource set.

In a practicable implementation, in a case that the search space is thecommon search space, the DCI includes at least one of: DCI forscheduling system information, DCI for scheduling paging information, orDCI for scheduling a random access response message.

In a practicable implementation, in a case that the search space is thegroup common search space, the DCI includes at least one of: DCI fortransmitting a group based power control command, DCI for transmittinggroup based slot format information, or DCI for transmitting group basedresource preemption indication.

In a practicable implementation, in a case that the search space is theUE specific search space, the DCI includes at least one of: DCI forUE-specific scheduling, or DCI for semi-persistent scheduling.

In a practicable implementation, time-frequency resources of controlresource sets corresponding to UE specific search spaces of PDCCHs ofdifferent UEs are orthogonal, overlapped or partially overlapped.

In a practicable implementation, the PDCCH transmitted with the commonsearch space has a QCL relationship with a synchronization signal or agroup of synchronization signals. There is a correspondence between thesynchronization signal or the group of synchronization signals and aphysical broadcast channel (PBCH) configuring a physical resource of thecommon search space.

In a practicable implementation, there being a correspondence betweenthe synchronization signal or the group of synchronization signals andthe PBCH configuring the physical resource of the common search spaceincludes that: time index(es) of the synchronization signal or the groupof synchronization signals and a time index of the PBCH configuring thephysical resource of the common search space are the same.

In a practicable implementation, the PDCCH transmitted with the groupcommon search space has a QCL relationship with a synchronization signalor a group of synchronization signals, and the synchronization signal orthe group of synchronization signals are configured by the networkdevice. Or, the PDCCH transmitted with the group common search space hasa QCL relationship with a channel state information-reference signal(CSI-RS) or a group of CSI-RSs, and the CSI-RS or the group of CSI-RSsare configured by the network device.

In a practicable implementation, the PDCCH configuration informationincludes search space position information of the UE, and a position ofthe search space of the UE is irrelevant to an identity of the UE. Thesearch space position information of the UE includes at least one of: astarting position of the search space of the UE, a control channelelement (CCE) aggregation level of the search space of the UE, or thequantity of PDCCH candidate resources of the search space of the UE.

In a practicable implementation, search space position information ofthe UE is pre-configured by a protocol, and a position of the searchspace of the UE is irrelevant to an identity of the UE. The search spaceposition information of the UE includes at least one of: a startingposition of the search space of the UE, a CCE aggregation level of thesearch space of the UE, or the quantity of PDCCH candidate resources ofthe search space of the UE.

In a practicable implementation, positions of search spaces of UEsmeeting at least one of the following conditions are the same: startingpositions of the search spaces of the UEs are the same, CCE aggregationlevels of the search spaces of the UEs are the same, or, the quantitiesof PDCCH candidate resources of the search spaces of the UEs are thesame.

In a practicable implementation, the PDCCH transmitted with the UEspecific search space has a QCL relationship with a synchronizationsignal or a group of synchronization signals, and the synchronizationsignal or the group of synchronization signals are configured by thenetwork device. Or, the PDCCH transmitted with the UE specific searchspace has a QCL relationship with a CSI-RS or a group of CSI-RSs, andthe CSI-RS or the group of CSI-RSs are configured by the network device.

In a practicable implementation, the PDCCH configuration informationincludes search space position information of the UE, and a position ofthe search space of the UE is relevant to an identity of the UE. Thesearch space position information of the UE includes at least one of: astarting position of the search space of the UE, a CCE aggregation levelof the search space of the UE, or the quantity of PDCCH candidateresources of the search space of the UE.

In a practicable implementation, search space position information ofthe UE is pre-configured by a protocol, and a position of the searchspace of the UE is relevant to an identity of the UE. The search spaceposition information of the UE includes at least one of: a startingposition of the search space of the UE, a CCE aggregation level of thesearch space of the UE, or the quantity of PDCCH candidate resources ofthe search space of the UE.

The network device 600 provided by the embodiments of the presentdisclosure includes but is not limited to the above-mentioned units. Forexample, the network device 600 may further include a receiving unit anda storage unit.

Embodiments of the present disclosure further provide a computerreadable storage medium. The computer readable storage medium stores acomputer program. When the processor of the network device 600 executesthe computer program, the network device 600 executes the steps of therelated method shown in any of FIG. 4 and FIG. 5 .

Embodiments of the present disclosure also provide a computer programproduct, which causes the computer to execute the steps of the relatedmethod in any of FIG. 4 and FIG. 5 when the computer program productruns on the computer.

The network device 600, the computer readable storage medium, or thecomputer program product provided by the embodiments of the presentdisclosure is for executing the corresponding methods provided above.Therefore, for the beneficial effects that can be achieved, referencecan be made to the beneficial effects in the corresponding methodsdescribed above, which are not repeated herein.

In a case where each functional module is divided according to eachfunction, FIG. 7 illustrates a practicable structural diagram of the UEinvolved in the foregoing embodiments. As shown in FIG. 7 , the UE 700may include a receiving unit 701.

The receiving unit 701 is configured to receive PDCCH configurationinformation transmitted by a network device; monitor a search space of aPDCCH of the UE indicated by the PDCCH configuration information, andreceive DCI corresponding to the search space of the PDCCH of the UE.The PDCCH configuration information is for indicating at least onesearch space of the PDCCH of the UE, and the search space is any one ofthe following types: a common search space, a group common search space,or a UE specific search space. Types of downlink control information(DCI) transmitted by the network device with the different types ofsearch spaces are different.

The receiving unit 701 is configured to support steps S402 and S501 inthe foregoing embodiments, and/or other processes in the technologydescribed herein.

In a practicable implementation, one common search space is commonlyused by N UEs, one or more common search spaces correspond to onecontrol resource set, and N is a positive integer greater than or equalto 2. One group common search space is used by a group including M UEs,and one or more group common search spaces correspond to one controlresource set, and M is a positive integer greater than or equal to 2.One UE specific search space is used by one UE, and one or more UEspecific search spaces correspond to one control resource set.

In a practicable implementation, in a case that the search space is thecommon search space, the DCI includes at least one of: DCI forscheduling system information, DCI for scheduling paging information, orDCI for scheduling a random access response message.

In a practicable implementation, in a case that the search space is thegroup common search space, the DCI includes at least one of: DCI fortransmitting a group based power control command, DCI for transmittinggroup based slot format information, or DCI for transmitting group basedresource preemption indication.

In a practicable implementation, in a case that the search space is theUE specific search space, the DCI includes at least one of: DCI forUE-specific scheduling, or DCI for semi-persistent scheduling.

In a practicable implementation, time-frequency resources of controlresource sets corresponding to UE specific search spaces of PDCCHs ofdifferent UEs are orthogonal, overlapped or partially overlapped.

In a practicable implementation, the PDCCH transmitted with the commonsearch space has a quasi-co-location (QCL) relationship with asynchronization signal or a group of synchronization signals. There is acorrespondence between the synchronization signal or the group ofsynchronization signals and a physical broadcast channel (PBCH)configuring a physical resource of the common search space.

In a practicable implementation, there being a correspondence betweenthe synchronization signal or the group of synchronization signals andthe PBCH configuring the physical resource of the common search spaceincludes that: time index(es) of the synchronization signal or the groupof synchronization signals and a time index of the PBCH configuring thephysical resource of the common search space are the same.

In a practicable implementation, the PDCCH transmitted with the groupcommon search space has a QCL relationship with a synchronization signalor a group of synchronization signals, and the synchronization signal orthe group of synchronization signals are configured by the networkdevice. Or, the PDCCH transmitted with the group common search space hasa QCL relationship with a channel state information-reference signal(CSI-RS) or a group of CSI-RSs, and the CSI-RS or the group of CSI-RSsare configured by the network device.

In a practicable implementation, the PDCCH configuration informationincludes search space position information of the UE, and a position ofthe search space of the UE is irrelevant to an identity of the UE. Thesearch space position information of the UE includes at least one of: astarting position of the search space of the UE, a control channelelement (CCE) aggregation level of the search space of the UE, or thequantity of PDCCH candidate resources of the search space of the UE.

In a practicable implementation, search space position information ofthe UE is pre-configured by the protocol, and a position of the searchspace of the UE is irrelevant to an identity of the UE. The search spaceposition information of the UE includes at least one of: a startingposition of the search space of the UE, a CCE aggregation level of thesearch space of the UE, or the quantity of PDCCH candidate resources ofthe search space of the UE.

In a practicable implementation, positions of search spaces of UEsmeeting at least one of the following conditions are the same: startingpositions of the search spaces of the UEs are the same, CCE aggregationlevels of the search spaces of the UEs are the same, or, the quantitiesof PDCCH candidate resources of the search spaces of the UEs are thesame.

In a practicable implementation, the PDCCH transmitted with the UEspecific search space has a QCL relationship with a synchronizationsignal or a group of synchronization signals, and the synchronizationsignal or the group of synchronization signals are configured by thenetwork device. Or, the PDCCH transmitted with the UE specific searchspace has a QCL relationship with a CSI-RS or a group of CSI-RSs, andthe CSI-RS or the group of CSI-RSs are configured by the network device.

In a practicable implementation, the PDCCH configuration informationincludes search space position information of the UE, and a position ofthe search space of the UE is relevant to an identity of the UE. Thesearch space position information of the UE includes at least one of: astarting position of the search space of the UE, a CCE aggregation levelof the search space of the UE, or the quantity of PDCCH candidateresources of the search space of the UE.

In a practicable implementation, search space position information ofthe UE is pre-configured by a protocol, and a position of the searchspace position of the UE is relevant to an identity of the UE. Thesearch space position information of the UE includes at least one of: astarting position of the search space of the UE, a CCE aggregation levelof the search space of the UE, or the quantity of PDCCH candidateresources of the search space of the UE.

In a practicable implementation, a reference signal used by the UE tomonitor the PDCCH in the common search space includes a widebandreference signal or a narrowband reference signal, the widebandreference signal is a reference signal transmitted in a control resourceset bandwidth corresponding to the common search space, and the narrowband reference signal is a reference signal in a CCE bandwidth occupiedby the PDCCH in the common search space.

In a practicable implementation, a reference signal used by the UE tomonitor the PDCCH in the group common search space includes a widebandreference signal or a narrowband reference signal, the widebandreference signal is a reference signal transmitted in a control resourceset bandwidth corresponding to the group common search space, and thenarrowband reference signal is a reference signal in a CCE bandwidthoccupied by the PDCCH in the group common search space.

In a practicable implementation, a reference signal used by the UE tomonitor the PDCCH in the UE specific search space includes a narrowbandreference signal, and the narrowband reference signal is a referencesignal in a CCE bandwidth occupied by the PDCCH in the UE specificsearch space.

The UE 700 provided in the embodiments of the present disclosureincludes, but is not limited to, the units described above. For example,the UE 700 may further include a transmitting unit and a storage unit.

Embodiments of the present disclosure also provide a computer readablestorage medium. The computer readable storage medium stores a computerprogram. When the processor of the UE 700 executes the computer program,the UE 700 executes the steps of the related method shown in any of FIG.4 and FIG. 5 .

Embodiments of the present disclosure also provide a computer programproduct, which causes the computer to execute the steps of the relatedmethod in any of FIG. 4 and FIG. 5 when the computer program productruns on the computer.

The UE 700, the computer readable storage medium, or the computerprogram product provided in the embodiments of the present disclosure isfor executing the corresponding methods provided above. Therefore, forthe beneficial effects that can be achieved, reference can be made tothe beneficial effects in the corresponding methods provided above,which are not repeated here.

Through the description of the above embodiments, those skilled in theart can clearly understand that, for the convenience and brevity ofdescription, only the division of the above functional modules is usedas an example. In practical applications, the above functions may beallocated to different functional modules according to needs. That is,the internal structure of the device is divided into differentfunctional modules to complete all or part of the functions describedabove.

It should be understood that in the embodiments according to the presentdisclosure, the disclosed device and method may be implemented in otherways. For example, the described embodiments directed to the device aremerely exemplary. For example, the modules or units are divided merelyin logical function, which may be divided in another way in actualimplementation, e.g., multiple units or components may be combined orintegrated into another device, or some features may be ignored or notperformed. In addition, the disclosed or discussed mutual coupling ordirect coupling or communication connection may be an indirect couplingor communication connection through some interfaces, devices or units,which may be implemented in electronic, mechanical or other forms.

The units described as separate components may or may not be physicallyseparated, and the components shown as units may or may not be physicalunits, that is, they may be located in one place or distributed overmultiple network units. Some or all of the units may be selectedaccording to practical needs to achieve the object of the technicalsolutions of the embodiments of the present disclosure.

In addition, functional units in various embodiments of the presentdisclosure may be integrated into one processing unit, or may bephysically independent, or two or more units may be integrated into oneunit. The integrated unit may be implemented in the form of hardware orin the form of software functional unit.

If the integrated unit is implemented in the form of a softwarefunctional unit, and sold or used as a standalone product, the unit maybe stored in a readable storage medium. Based on this understanding,essence of the technical solution of the present disclosure, or the partcontributing to the related technologies, or all or part of thetechnical solution, can be embodied in the form of a software product.The software product is stored in a storage medium, and the softwareproduct includes a number of instructions to enable a device (which maybe a single chip microcomputer, a chip, etc.) or a processor to performall or part of the steps of the method described in the variousembodiments of the present disclosure. The storage medium includes a USBflash disk, a mobile hard disk, a read-only memory (ROM), a randomaccess memory (RAM), a magnetic disk, an optical disk, and other mediumwhich can store program code.

Optional embodiments are described hereinabove. The protection scope ofthe present disclosure is not limited thereto. Any modification orsubstitution made without departing from the technical scope of thepresent disclosure shall fall within the protection scope of the presentdisclosure. Therefore, the protection scope of the present disclosure isdetermined by the protection scope of the claims.

What is claimed is:
 1. A method for configuring a search space of aphysical downlink control channel (PDCCH), applied to a network device,comprising: transmitting PDCCH configuration information to a userequipment (UE), wherein the PDCCH configuration information is forindicating at least one search space of a PDCCH of the UE, and thesearch space is a group common search space, wherein the search space ofthe PDCCH is a space in which the UE performs detection of the PDCCH;wherein types of downlink control information (DCI) transmitted by thenetwork device with the different types of search spaces are different;in a case that the search space is the group common search space, astarting position of the search space of the UE is irrelevant to anidentity of the UE.
 2. The method according to claim 1, wherein thegroup common search space is used by a group including M UEs, one ormore group common search spaces correspond to one control resource set,and M is a positive integer greater than or equal to
 2. 3. The methodaccording to claim 1, wherein in a case that the search space is thegroup common search space, the DCI comprises at least one of: DCI fortransmitting a group based power control command, DCI for transmittinggroup based slot format information, or DCI for transmitting group basedresource preemption indication.
 4. The method according to claim 3,wherein the PDCCH transmitted with the group common search space has aQCL relationship with a synchronization signal or a group ofsynchronization signals, and the synchronization signal or the group ofsynchronization signals are configured by the network device; or,wherein the PDCCH transmitted with the group common search space has aQCL relationship with a channel state information-reference signal(CSI-RS) or a group of CSI-RSs, and the CSI-RS or the group of CSI-RSsare configured by the network device.
 5. The method according to claim4, wherein the PDCCH configuration information comprises search spaceposition information of the UE, and a position of the search space ofthe UE is irrelevant to the identity of the UE, and wherein the searchspace position information of the UE comprises at least one of: thestarting position of the search space of the UE, a control channelelement (CCE) aggregation level of the search space of the UE, or thequantity of PDCCH candidate resources of the search space of the UE; or,wherein search space position information of the UE is pre-configured bya protocol, and a position of the search space of the UE is irrelevantto the identity of the UE, and wherein the search space positioninformation of the UE comprises at least one of: the starting positionof the search space of the UE, a CCE aggregation level of the searchspace of the UE, or the quantity of PDCCH candidate resources of thesearch space of the UE.
 6. A method for monitoring a search space of aphysical downlink control channel (PDCCH), applied to a user equipment(UE), comprising: receiving PDCCH configuration information transmittedby a network device, wherein the PDCCH configuration information is forindicating at least one search space of a PDCCH of the UE, the searchspace is: a group common search space, wherein the search space of thePDCCH is a space in which the UE performs detection of the PDCCH, andtypes of downlink control information (DCI) transmitted by the networkdevice with the different types of search spaces are different; andmonitoring the search space of the PDCCH of the UE indicated by thePDCCH configuration information, and receiving DCI corresponding to thesearch space of the PDCCH of the UE; wherein in a case that the searchspace is the group common search space, a starting position of thesearch space of the UE is irrelevant to an identity of the UE.
 7. Themethod according to claim 6, wherein in a case that the search space isthe group common search space, the receiving the DCI corresponding tothe search space of the PDCCH of the UE comprises at least one of:receiving DCI for transmitting a group based power control command,receiving DCI for transmitting group based slot format information, or,receiving DCI for transmitting group based resource preemptionindication.
 8. The method according to claim 7, wherein the PDCCHtransmitted with the group common search space has a QCL relationshipwith a synchronization signal or a group of synchronization signals, andthe synchronization signal or the group of synchronization signals areconfigured by the network device; or, wherein the PDCCH transmitted withthe group common search space has a QCL relationship with a channelstate information-reference signal (CSI-RS) or a group of CSI-RSs, andthe CSI-RS or the group of CSI-RSs are configured by the network device.9. The method according to claim 8, wherein the PDCCH configurationinformation comprises search space position information of the UE, and aposition of the search space of the UE is irrelevant to the identity ofthe UE, and wherein the search space position information of the UEcomprises at least one of: the starting position of the search space ofthe UE, a control channel element (CCE) aggregation level of the searchspace of the UE, or the quantity of PDCCH candidate resources of thesearch space of the UE.
 10. The method according to claim 8, whereinsearch space position information of the UE is pre-configured by aprotocol, and a position of the search space of the UE is irrelevant tothe identity of the UE, and wherein the search space positioninformation of the UE comprises at least one of: the starting positionof the search space of the UE, a CCE aggregation level of the searchspace of the UE, or the quantity of PDCCH candidate resources of thesearch space of the UE.
 11. A user equipment (UE), comprising: aprocessor, a memory, and a program stored on the memory and executableby the processor, wherein, when the program is executed by theprocessor, a method for monitoring a search space of a physical downlinkcontrol channel (PDCCH) is implemented, the method comprises: receivingPDCCH configuration information transmitted by a network device, whereinthe PDCCH configuration information is for indicating at least onesearch space of a PDCCH of the UE, the search space is: a group commonsearch space, wherein the search space of the PDCCH is a space in whichthe UE performs detection of the PDCCH, and types of downlink controlinformation (DCI) transmitted by the network device with the differenttypes of search spaces are different; and monitoring the search space ofthe PDCCH of the UE indicated by the PDCCH configuration information,and receiving DCI corresponding to the search space of the PDCCH of theUE; wherein in a case that the search space is the group common searchspace, a starting position of the search space of the UE is irrelevantto an identity of the UE.
 12. The UE according to claim 11, wherein in acase that the search space is the group common search space, thereceiving the DCI corresponding to the search space of the PDCCH of theUE comprises at least one of: receiving DCI for transmitting a groupbased power control command, receiving DCI for transmitting group basedslot format information, or, receiving DCI for transmitting group basedresource preemption indication.
 13. The UE according to claim 12,wherein the PDCCH transmitted with the group common search space has aQCL relationship with a synchronization signal or a group ofsynchronization signals, and the synchronization signal or the group ofsynchronization signals are configured by the network device.
 14. The UEaccording to claim 13, wherein the PDCCH configuration informationcomprises search space position information of the UE, and a position ofthe search space of the UE is irrelevant to the identity of the UE, andwherein the search space position information of the UE comprises atleast one of: the starting position of the search space of the UE, acontrol channel element (CCE) aggregation level of the search space ofthe UE, or the quantity of PDCCH candidate resources of the search spaceof the UE.
 15. The UE according to claim 13, wherein search spaceposition information of the UE is pre-configured by a protocol, and aposition of the search space of the UE is irrelevant to the identity ofthe UE, and wherein the search space position information of the UEcomprises at least one of: the starting position of the search space ofthe UE, a CCE aggregation level of the search space of the UE, or thequantity of PDCCH candidate resources of the search space of the UE. 16.The UE according to claim 12, wherein the PDCCH transmitted with thegroup common search space has a QCL relationship with a channel stateinformation-reference signal (CSI-RS) or a group of CSI-RSs, and theCSI-RS or the group of CSI-RSs are configured by the network device.